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The owner of a company wanted to understand the length of phone call conversations between the company's employees and their customers. The owner took a

The owner of a company wanted to understand the length of phone call conversations between the company's employees and their customers. The owner took a random sample of phone calls and recorded the length, (minutes), then summarised these in the following frequency table:
Class (minutes) Frequency (0, 20] 45 (20, 40] 35 (40, 60] 90 (60, 80] 30 Total 200

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